I composed a reply but when I submitted it I got an error, and the post now seems to have disappeared into the ether.
Yep, you're sick.
I use it to indicate approval or agreement or to indicate I generally enjoyed or found interest in the post, but not to the extent that it warrants a thumbs up or some other stronger emotion. I never use it with a negative intent.
On that note however, what the f#%k is up with LOL. Whats wrong with Haha or a smiley face?
Anyone that posts 'First' as the first reply on a discussion should flayed alive, hung, drawn, quartered, and scattered to the 4 corners of the earth.